Ergonomic pen



FIG. 1 is a front elevational view of an ergonomic pen showing my newdesign;

FIG. 2 is a side elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a side elevational view of the side opposite that shown inFIG. 2; and,

FIG. 5 is an exploded perspective view thereof.

The ornamental design for an ergonomic pen, as shown and described.